4 months pregnant, forehead always feel hot, may be physiological factors, the occurrence of infection, allergies and other reasons, it is recommended to check and treat. 1. Physiological factors: after pregnancy, the body temperature may have a small change, if the measured temperature is within the normal range, there is no need for treatment. 2. Infection: The most common causes of fever include viral infection, bacterial infection, etc. Cold towels and alcohol wipes can be used to dissipate the heat. It is recommended to go to the hospital for checkups, and based on the results of the checkups and the doctor’s clarification of the cause, it will be decided whether or not medication is needed. 3. Allergy: contact with allergic substances, such as pollen, dust, hair, etc., should be away from the allergens, if the symptoms are serious, skin rashes, respiratory difficulties and other symptoms, it is recommended to seek medical treatment as soon as possible. There are other possible causes of forehead burning during pregnancy. If the symptoms of forehead burning occur for a longer period of time or are accompanied by other uncomfortable symptoms, it is recommended to consult a doctor in time to avoid delaying the condition.